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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7991c9dfca922803c21b47b50180d05d7f9829bc22918f51ad89c9baf787f8e' 
  AND token = 'kzZjLCjS2gfTGmatf8SBw39B2RUP3QoYEyyuY87z4oI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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