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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1d7600b693e1868fd533ddcd9270a439c8ded20a9c2ba5e90f6562064534018' 
  AND token = 'rin0R+BJHU95pq7aHBxxUTGgxC3gW9Z2wl8Hq/3GTdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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