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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aec625e4e37cfd8b5871ef0fa9307d3d959e9f755c210569972df3b2e48dc0e7' 
  AND token = 'c5PRyX0i84qjBiHKlDHY1Iid8n97F7kQuApKluPwsKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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