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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2eabf8da0ac40e7534d5ffee28a833ef74320da3adf253a6822c8df5a6c665a' 
  AND token = '2JhvvrRFUHwxduFyNYz3E+WBofO2VjI6pf7bjJXh/Y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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