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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9eda4cb31a5eb0b363de7814744448c959fb62d09d53ea3adeba56ba8b5b9a0' 
  AND token = 'LRlQ0m2meE0kY8U5m9zAzkCg+GsfH+EK6LvSfV9+WIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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