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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cfb25fbe0220a92c1f8e397140ab933dac24457eb92a468b884fd313e719c92' 
  AND token = '7Iala+y5wuXbo+r4+dso+DPiuYnMMe5O0i4nFME8tc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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