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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed91796386c9813af31535a51ab55e9340ed8be121d0ef7f7ded71bd8bbe015f' 
  AND token = 'ncCw02EqxF0TSGOLUGcpwN7QFwEzq9jSQdwRUlwAsSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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