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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9417475eb832265ab94cee289e223805c1975d3fc2c66a3f548a2235b5abe07f' 
  AND token = 'v5WeGsFSl/mS3Xoa27wAXJqoy9sHf3pJpdCywuyVhgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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