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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bf03418677360e6074c56f1f82cd68b30d8c4c1f119ebf7259be98a3566020d' 
  AND token = 'rE0EUkID4yGYy+o7Ubny4NlAPkgUxCiaXXgTEw7CkgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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