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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab5fc05ec9d39cdba4cf5ebeee5cf25aba85d4c01aab0c60b134dcb3f47a3824' 
  AND token = 'y+lW1K7y5dPBCx7DXAaWn31svbM5NAVK6yr+cRKBPlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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