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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f1c2308e5f2e818b2b679be8f826dfdea6eda9c78546ea53593eaa3d19f18ed' 
  AND token = 'xm5zL9eJXsGr58Q5HU7LK9vnFdeNTKy/tqGopTK+1Jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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