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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '496976d5d2e97e988a66b9907e15c085bf37563767bf8e3bf8c507e5b8d28a93' 
  AND token = 'ViwLRZoLEAuEadikjbLSvEXHrN8d9vluGfhgoz8IIJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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