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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd37281d263ab6aa6fcee529d406b634501557eba4f89e8e439e7fbc0903a6c36' 
  AND token = 'UEuw733C19iKeSF3iMTwGGW9aBLvsWBKLPFZ6pJ3dW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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