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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e62c731a41be0ca15b9ed1d012efd851b1804b5f157531a43a00dab0e1a1d7f' 
  AND token = 'HcIgVaFy0VOTIUuTvR1qa3qPdNH5lhPVCCxES891eOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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