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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c663f595efd30d5ebbc50cd86fafbf76ef50f888422045fd6d8750e88d710ac' 
  AND token = '9k6b+8hwkHvxdE1RIDhmbT6eIrlv4x4He+OZx1qGfGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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