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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07bc00a5525bbaacbd11612eddd2924f3f4f69e00a5f5acad41016bcd59468bc' 
  AND token = 'iMr8X81mysrbxT2UfDDpRxDrFqBsVoAaWtlaqKd1Qwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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