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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '040fc65b734f7e84313ba78709584a298b9856ca66b8d4a6d5db49ff323cbc3b' 
  AND token = 'hk5l+268kDCsfmMyRdYNb4rYsGTnY3k4OtHQvnEe71k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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