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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b09a6b8ef6371a7f7809cd9d32ce7b07373d66aa787b43553494f25c4cff5da' 
  AND token = '3v2+0RDNgtCgD0odq9Zoh4eyDZsplc0cTu5jsKuX0Xo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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