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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb5098525dccabf258927965813ff80c08ff903bc509322828a14aa9e4804687' 
  AND token = '1Fow7z3RgtjqAFW/dMsPKx7R3x5gsDSnNFTA1cWLzSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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