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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b039371cf530513a55d987df77aa61a314cccc503ee4666b2b353ce1a08f4b78' 
  AND token = 'yEW+n65yuUrfPFf46xckbXXnHVxm8bcaypeNM/6OlcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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