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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76daf7e4c1f5c276328b3eb3548cbb48d68c1fdbe47331ec41659e6dea0333eb' 
  AND token = 'b2MQz//RFkLomgCkNB5PhawoUzB4BworbR9BX1YimUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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