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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'add0365ead9d8004174b9f8fbf0d65f8d2bb044f93827b855946cde417cbc224' 
  AND token = '8Nfxexd9rSZ4LsStUNt7e8tp/S0r3usRz8X+t+nng8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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