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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cc4eb6622df636b1e69f60c16ff7e7dceffaa0addafc1300d2f00a147cfd547' 
  AND token = 'etLA6jWAQ8pKcKE6Oi1kztPvVJF2xRcBELf36ELSG60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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