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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e347424a4b29f5c524fa55e5913a33959d2666f3bc8e7ea3f80d2b9ccf55fee' 
  AND token = 'EWzAMns0z01Er8zDx3fxoi04Yhyw0u3gD9tB+GPupRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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