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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96598008f9da337da1282884a9f3ac52990a5eec86be26597967a19cae0b62ef' 
  AND token = 'hvt8PxcS8SKeu0Nsc90rwndK5WNg+oaOK0hZ81ClF5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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