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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48edce46add1718f60df63a8624567958d4b29bb75d28016235d1915a2f3baea' 
  AND token = 'rWDyYdGolhXMLXzGedlp7EYYYEHoY9wdXlcMt2FvVZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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