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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53060efd446ac87ebdd099587a30ee6ab1f26dc3d05595c96cf1d941f57cedfe' 
  AND token = 'lW/iI/EGg7OcJIKaxw0oYkH7xrenqAuwBPO6xXAruno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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