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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e19b2176b1d1be94d060a99f520785e1342d95d31b9452e0954daa434375545' 
  AND token = 'kemQfHJlcSbQF6yy3f5OTdRHGGUbTlBZBrxyG3GhqN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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