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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df43d4bfb3c140773ef9f41173e2044242e186a9a2acae0ca180541a3d16df5b' 
  AND token = '9Hpp7qf6Ja83/1OazbxzUy9IMrVr3dXnOh1E2G3GApk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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