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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea2ccee2a805464c3ce52b5a09e8222dbf34f3f9c26c3806744691462110aec1' 
  AND token = 'EgltWIi8X+aWl6VhrQZBXE3XNnk04wceRPgJ0ihn4dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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