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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '951ffb8505b6b742c8a2d20155e504bfaa2c0771845d37c57a5a9b8a4d56fba6' 
  AND token = 'eUAfffKajrILO1uVyBYXlLi01rhr+iL/dhYIYkhRdqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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