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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4492088ffeb8a79a87e4408cdc4ccf60b05b181ea059036b987d85c609cdae13' 
  AND token = 'TemXRsDtVr3PUsmnsEyiOqXnWufx8G+KXblu+QDchUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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