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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0204496310ce8d71f804893fc762b0028363a60c2cbd8f591612a2421641fbc4' 
  AND token = 'UrhvPWn7cwjxLJNAv2Q6O6vkq2sfjvEvEROuIHSk1hg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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