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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f04be6abdbd5df0aeff9e726909b5ab8bd4b4b49e1c791e97ba5a6429d3226c3' 
  AND token = 'IdbbzDra7k+b0T9fPkCt48iMSHae0EZNN4gRQgZnDq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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