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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf1237173bbcc9a39ed06473bd5304adac64e9401590103b047094c6df1d8fa2' 
  AND token = 'soPwFOEOPnsu7xlukdvjSIRFeq7DVqqFA6c6pALdHSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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