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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90ef505825e66727a864b7a555e6fd3072df787b714c216b756875a9d85bd8df' 
  AND token = 'jMnyZs995MZNpMk5n35e2IKz7OBCAtAGN5TmEQhPolA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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