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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef7f5b9302958dc9180b847c8c7019d788bd38ddad0bd8d2e54fb1b1ed9ac2e9' 
  AND token = '51QlE4RJQ9k2MEsN4NhkZD9iiepQV3x0WZ335F70c90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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