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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04aa43ccaa6673fd67119e268486854e304c6346a21739a79dcb7454337b43c6' 
  AND token = 'Pm4QDji2BPRzrBClsNG4qGqMHU9veLM25fFAmPv3/4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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