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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28518319d2c202e3c7a84c5f102aca9b78e91a78abe1108310f2ec9476b7a26e' 
  AND token = 'bYbA/lbCYOzbkFJ3S7MpihnkuqG1UN1QC2kHotMM7So=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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