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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '709de44ba4a4830536dfce784c4d3fb15e5a3eb764b09b0ef26dc659a445b417' 
  AND token = 'ySq5zqCRyYVV0pyZxv1s3CFDkQgP2TNafjNBQw6naTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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