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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93b35e2b2e9cd0da94cd7980dd3a8deb840d0abef18b24bc800bb7376e56206a' 
  AND token = '1zYt4MGNGUdCGc6J+IgrCEmTpEsX40minr8S8RvxNMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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