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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd785ff28ca5653f90a70b6072e958d88f1ce30bf76b330d6061c6afa7263c44f' 
  AND token = 'TWydCL/ahq58Q08eKSKypRl+bE/EBwS3u8iagHECPKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}