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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79103b0fb41abc3db5a6c4be410d8820077f5026d8428966dd4d33b9eb17a4d6' 
  AND token = 'swFnZZdEsHTOFRTfLc1IskebmTcR2AkK5iHmi6kM7Z4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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