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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db4cbc8dbcf36c1373def01ba2f4fcc3819924c915d6c035de31d0b92326ec7e' 
  AND token = '6wory48WCLR38mTqs3Ivsju2Gj+ZUugMFeLnVV8FoRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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