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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e733d77066515a49bf0b32ee735db9a17744a885c73cb011aa78e9b2606bad51' 
  AND token = 'np/ppVu/TCpzyZPro8LjtS/eS2tJgi/ks0aPOXE+RxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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