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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c01acc903ab01e345bd406b3464579d7413a15a1b1b32729b726756768592847' 
  AND token = 'tqcDPYCkkJOxEc7FDNegP29F5bjuBaj/5zhNCcmZqBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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