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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe97ff52f7ff0f06df66e672ebcf6f3254dac0d022923a1346bf0eb93e7829b0' 
  AND token = 'CN81ig5uNdj38Xt3LhTusf2N2QEPlrgylJA+DiWbN7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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