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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aca44bd9fa2b30df15f71461d577f8e6ad22fbc40027549e8c0ed851e111ec56' 
  AND token = '9w8d8A1KcaI7iT5J7n/NyawV+qj3uJB3hSXlhilhXdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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