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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87ee41c155e4a035e47db1f2284b5fe0bb86c480eb15d92147a21d05e43443b1' 
  AND token = 'omI2FcJio8UByVgcOzI3pgMk/P6RCYaq+OBz1hZAYeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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