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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b91af7da982983e198cdc76a7dcceb3fa7b0da6715cf800c91c6fc11e7377c62' 
  AND token = 'pDHowBr5Lb9qacJvI9OQM8lcmeNFDtsd9O1F77Nej2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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