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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23158789c19460e52ef9949e55387978950993001a4d60b713428d9a898054c4' 
  AND token = 'o40bP0Skb4zd9Kt+QSBxntzXOtNSzt7T9I1I/Xz2PaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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