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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e792414993431764f4fd10e0e484c0bc6b58a6aafe32123239722c0557429313' 
  AND token = 'j6sfGZ4gyPB7io5LL0LuMPVo5uIRVMNfXww7322SbZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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