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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ca7b19309b4e0a2a4f5c4b1b295b72d74bc04053b274af5d703753642025b31' 
  AND token = 'L0KI7J1hzZIwnJz4aqPXetpCUMrVSQsZaL2pLXxNeQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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