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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '496ca0dde5cd38080d789ec6df615ab1b9d8b339f26aae1967e93525c3007856' 
  AND token = 'f7ojoFjKH4D3DZF2B3NFO6J5I/3PNxenCulmjhu62uE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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